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Bluing may be applied by immersing steel parts in a solution of potassium nitrate, sodium hydroxide, and water heated to the boiling point, 275–310 °F (135–154 °C) depending on the recipe. [6] Similarly, stainless steel parts may be immersed in a mixture of nitrates and chromates, similarly heated.
Bluing is most commonly used by gun manufacturers, gunsmiths and gun owners to improve the cosmetic appearance of, and provide a measure of corrosion resistance to, their firearms. Bolt action: A type of firearm action in which the firearm's bolt is operated manually by the opening and closing of the breech with a small handle.
Engineer's blue is prepared by mixing Prussian blue with a non-drying oily material (for example, grease).The coloured oil is rubbed onto a reference surface, and the workpiece is then rubbed against the coloured reference; the transfer (by contact) of the pigment indicates the position of high spots on the workpiece or conversely highlight low points. [1]
So, bluing is not a "gun-only" terminology. Because bluing does not change the dimensions of steel parts by an easily-measured amount, it has long been used to achieve corrosion resistance for steel parts, while always ignoring any tolerance buildup for mechanical dimensions of blued steel parts versus the same unblued steel parts.
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The first nuclear explosive devices provided the basic building blocks of future weapons. Pictured is the Gadget device being prepared for the Trinity nuclear test.. Nuclear weapons design are physical, chemical, and engineering arrangements that cause the physics package [1] of a nuclear weapon to detonate.